The kittens start to open their tiny eyes when they are ten days old. The kittens are born with their eyes closed. By the end of the first week kitten should double in body weight. Read more from pawsonline.info/lookingafterkittens.htm.
Kittens open their eyes about seven to ten days after birth. At first, the retina is poorly developed and vision is poor. Kittens are not able to see as well as adult cats until about ten weeks after birth.